Paper bag or container



P. T. JACKSON PAPER BAG OR CONTAINER.

APPLICATION FILED DEC.

I9, I9I4.

Patented Mar. 16, 1920.

i a iiiliiiiiiiiii d UNITED STATES PATENT OFFICE. 1

PATRICK TRACY 'IACKSON, JR., OF CAMBRIDGE, MASSACHUSETTS, ASSIGNOR TO PAPER PRODUCTS MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

PAPER BAG on CONTAINER.

Specification of Lettersratent. Patented Mar. 16, 1920.

Application filed December 19, 1914. Serial No. 878,188.

To all whom it may concern:

Be it known that I, PATRICK TRACY ACK- SoN, Jr., a citizen of the United States, re-

siding at Cambridge, county of Middlesex,

and State of Massachusetts, have invented an Improvement in Paper Bags or C ontainers, of which the following descriptlon, in connection with the accompanying drawings, is .a specification, like letters on the drawings representing like parts.

The invention to be hereinafter described relates to bags or other forms of containers,

and more particularly to paper bags for the corners, especiall Where the bag or con 'paper or the like.

tainer is formed of olded material, such as Indeed, a bag or container will frequently develop such weakness along the edges that those portions give wa under the strain of the contained material while the body portion of the 'bag or container ma still remain in substantially perfect cond1tion. In the application .to which reference .has been made, a good, practical means was described and claimed for giving such additional strength or re1 nforcement to the edge portions of bags or containers, that the life of these edge portions would be prolonged in some cases to the life of the body portions of the bag or container itself. 4 1 In some cases, however, not alone are the edge portions subjectedto the strains, wear, and friction to which said prior application refers, but other portions of the bag or container are exposed to special strains and frictional wear. tain kinds of material is shipped, stored, or handled in a bag or container, the latter; is 'made to stand upright on the bottom por-. tion thereof, so that the strains and wear that act peculiarly to ru ture the bag or c0'ntainer alon the folded edge line and as stated in said application, also act with more or less-rupturing tendency over the entire bottom or side edge portions of the bag or For instance, .where cercontainer. Where potatoes, coal, or other semi-granular material is shipped or stored in bags, it is the custom to stand the bags .on end, elther with or without closing the mouth of the bag, and in such cases it will be noted" that not onlyis the folded edge of the bag sub ected to strains and wear tendin to'rupture the bag along such line of fo (1, but the entire bottom portion of the .bag is called upon to resist the internal strains and frictional wear incident-to such use. The same is true of'the side edge portlonsof the bag, especially where the bag is laid upon such edge. Toward the top and the median portionsof the sides, the bag is subjected to much less strains and wear;

With these facts in mind, the objects and aims of the present invention are to provide a bag or other container with reinforcing threads adhesively secured thereto and" of maximum reinforcing eflect at the weakest part of the bag or container, and of gradually diminishlng reinforcingefi'ect toward. those parts of the bag or container that are less liable to rupture, all as will hereinafter more fully appear. forcing effect may be secured by adhesively securing larger or stronger reinforcing.

threads at and adjacent. the folded edges of the bag or container, and gradually de- This maximum reincreasing the size or strength of the threads from the bottom to the top or from the side edges to the median portion of the sides.

Obviously, also, the same conditions maybe secured by increasing the number of remforcing threads at the bottom-or sides by placing them closer together and progressively separatin them more and more fromthe'bottom to t e top or from the sides toward the median central portion, as will more fully appear. In either case, however, the bag or container will have a maximum reinforced zone where it is weakest and subj ected to the greatest wear and strains, and from such zone the gres'sively decrease. In the draw1ngs:

Figure 1 is a erspective view of a container or bag em odying the present invenv tion Fig. 2 is an enlarged section on the line "105' is an enlarged section on the line 2 2, Fig", 1;

reinforcement -will pro- I 33, 1, showing the overlapping parts separated for clearness; and

Fig. 4 is a section similar to that of Fig. 2, showlng the reinforcing threads closer together at the bottom of the bag or container and progressively separated more and more toward the top of the bag.

The container may be of any appropriate :shape for its intended use, and as shown in the drawings, is exemplified as a paper bag, substantially as indicated in Fig. 1'.

The container or paper bag may be appropriately formed from a blank, which, when folded into the desired shape with the parts secured together, may present the general configuration as indlcated 1n Fig. 1, wherein the side portions 2 may extend continuously from the mouth of the bag and around the bottom, While the side edge portions may be formed by parts of the blank being overlapped and appropriately secured inforced by a longitudinal together by an adhesive, or,otherwise.

In the invention as'illustrated, the paper bag is preferably formed of two plies of paper 3, 1, which v may be secured together, preferably by a water-proof material, and when folded into the finished articles, has extended along its bottom and along its vertical sides, a folded edge. This characteristic fold in-a bag formed of paper is emphasized, as will be readily understood, when the bags arein flat condition during shipment and,storage; and as pointed outin the application hereinbefore mentioned, such folded edge portions are preferably rereinforcing thread, cord, tape, or the like, which will hereinafter be designated as a reinforcing thread.

WVhen a bag or container, as hereinbefore generally constructed, is filled with granular material or semi-granular material, and is stood on end, not only isthe folded edge portion thereof subjected to excessive strain and frictional wear, but a zone of the bag or container is flattened out to some extent to provide a base support, and this entire zone is thus subjected to substantially the same wear and frictional destructive forces that pertain to the folded edge. The present invention contemplates, therefore, such reinforcement of the bag or container by reinforcing threads adhesively secured thereto, that such zone of the bag which is. subjected to rupturing strains and frictional wear, shall 'be reinforced to a maximum extent and that the other portions of the bag or container extending from said zone, shall be reinforced less and less as the distance from said zone increases.

In carrying the invention into practical eifect, the bottom folded. edge 5 of the bag .or container may have extending lon 'itudinally thereof, a heavy or. large reinfbrcing thread 6, Figs. 1 and 2, adhesively secured along the folded edge by aheavy reinforcing thread, but that portions of the ba at each side of the heavy. reinforcing threa are reinforced by threads gradually decreasing in reinforcing effect toward the top or mouth of the bag, the construction being such that when the bag or container is filled with granular or semi-granular material and is -stood upon the bottom portion thereof, such bottom portion flattens out to some extent and the zone of maximum reinforcement at the bottom of the bag serves to give a requisite strength not only to the folded edge at the bottom, but also to those portions of the bottom at eachside adjacent thereto, such zone of reforcement gradually diminishing in reinforcing efl'ect toward the upper-portion of the bag where such maximum reinforcement 1S unnecessary.

As a further means for giving strength and wear-resisting qualities to the bag thus formed, other threads 11 may-extend longitudinally of the side portions 2 of the bag continuously around the bottom of the bag and overlie the graduated reinforcing threads hereinbefore described.

The side edge portions of the bag are also subjected to excessive strains tending to rupture the bag along the folded edge 12, and at parts adjacent thereto, and the present invention contemplates provision of heavy reinforcing threads 13 extending longitudinally along the sid edge portions, as indicated in Fig. 3, an other longitudinallyextending threads 14, 15, 16 and 17-, of graduallydiminishing size, extending substantially parallel to the heavy reinforcing threads 13 at the side edge portion, substantially as indicated in Fig. 3. These side edge portions of the bag may be appropriately formed by overlapping the edge portions 18 and 19, Fig.- 1, which may be secured together by appropriate means, 'such' as an adhesive or otherwise, and such overlapping portions at the side edge portions of the bag may have longitudinally extending threads 14, 15, 16 and 17 thereof, crossed by other threads 20, as indicated in Fig. 3, the construction being such that'th'e'side edge portions of the bag are reinforcedin a manner similar to the bottom portion of.

the bag, as hereinbefore described, by means of reinforcing threads which form a zone of maximum reinforcingmfi'ect along the side and adhesively secured thereto, the crossed reinforcing threads; but instead of making the reinforcing threads along the bottom edge portion of the bag of heavy or strong character and progressively diminishing the size of the threads parallel thereto at each side of the edge toward the top of the bag, the modified form of the bag illustrated by Fig. 4 shows the reinforcing threads 21 at the bottom of the bag of substantially the same size, but to effect the maximum reinforcing effect at the bottom portion of the bag, these threads about the bottom portion of the bag are placed closer together and are gradually separated more and more'in their parallel relation toward the top of the bag. Obviously, the same effect can be secured along the side edge portions of the bag by spacing the threads closer together along the side edge portions and gradually separating them more and more toward the median or central longitudinal portion of the bag.

From the construction described, it will be apparent that the present invention supplies to the bag maximum reinforcement at that portion of the bag which is subjected to the greatest strains andwear, and gradually diminishes this reinforcement toward those portions of the bagwhere the wear and strains are less, thus providing a bag or container which shall be responsive throughout its construction to the proportional strains and wear incident to the different portions of the bag or container when in use.

embedded in the waterproof material between the two plies of paper a series of unwoven reinforcing filaments which extend longitudinally of the sides of the bag and about the end thereof, the side edges of the bag being formed of overlapping flaps and providing a maximum strength to the bottomside edges of the ba said unwoven reinforcing filaments being of greater strength along the side edges of the bag than along the parts intermediate the side edges.

2. A bag or container formed'of two superposed plies of paper having a layer of waterproof adhesive between them and connectingt'them together, a series of unwoven reinforcing filaments extending circumferentially of the bag and embedded in the waterproof adhesive which secures the two plies of paper together, the reinforcing filaments along the bottom of the bag being of greater strength than at the top, and the :side. edges of the bag being overlapped to ,form a side seam for the bag.

3. A paper bag or container formed of two separate plies of aper sheets secured in superposed relation y a waterproof adhesive, a series .of unwoven reinforcing filaments extending longitudinally and circumferentially of the bag and embedded in the waterproof adhesive Which-connects the two superposed plies of paper, the vreinforcing filaments being of greater size along the bottom and side edges of the bag, and the side edges of the bag being overlapped to provide a four ply thickness of reinforced waterproof material.

In testimony whereof, I have'signed my name to this specification, in the presence of twosu'bscribin witnesses.

PATRICK T ,ACY JACK-SON, JR. Witnesses: L

HnRMAN WARREN SHAW, ROBERT GEORGE JENNINGS. 

